Are you storing them so that you can do the minipreps at a later time? In that case, I would spin them down, remove all traces of supernatant by inverting the tubes on a paper towel, and store the cell pellets at -20C. 

Hi Daad! Yes, that is the plan! Would it be ok to do that? Would the plasmids stay intact?

Hi Julio,

Yes, I have done that in the past and stored the pellets at -20C over the weekend. Good luck!

Hi, Julio, at -20°C you can store pellet for a relatively long time, 10 days can be OK as well.

I did not test longer time, but 10 days seems to be OK. Good luck!